Nazrul Hoque, editor
Opportunities and challenges for applied demography in the 21st century
[, Springer-Science], 2012
 eBooks
Traffic congestion and traffic safety in the 21st century : challenges, innovations, and opportunities
American Society of Civil Engineers, 1997
 Buku Teks
Gardiner, Gareth S.
21st century manager: meeting the challenges opportunities of the new corporate age
Peterso's, 1996
 Buku Teks
Bouvier, Leon F., author
World population : challenges for the 21st century
Seven Lucks Press, 1999
 Buku Teks
Southeast Asia : challenges of the 21st century / by Janadas Devan
Institute of Southeast Asia Studies , 1994
 Buku Teks
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